Micrometer caliper



I. P. CLULEY MICBOMETER CALIPEB- APPLICATION FILED JUNE 21, 19 1.

1,414,550. Patented May 2, 1922.

u u' 18 a 1 ll 25 26 [8 l/ JOHN PL CLULEY, OF CHICAGO, ILLINOIS. I

MICROMETER CALIBER.

release.

"To all whom z't may concern: 1

' Be it known that 1, JOHN P. C nurrr, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and and tool rooms, paper mills and all such other places where the article to 'the calipered can be brought to the caliper.

' It contemplates'a micrometer caliper that can not be easily stolen, one than can not be lost in thetailings on the floor and one that can be quickly adjusted and easily read.

With the above a o her objects in view, 2

this invention consists in the construction,

-combination,-and arrangement of parts, all

as hereinafter more fully described, claimed,

and illustrated inthe accompanying drawings, wherein? 1 Figure 1 1s a sectional view of the opelrable parts of the micrometer; Figure 2 is'a top plan," and Fig. 3 is a sketch of the opera- 1 .ble portion of the carrying-mechanism of for the purpose of making the'tripping acthe dial numerals.

Referring morepart cularly to the draw- I ings, 1 is a cast iron base containing all of theLparts of the micrometer. Through a hole '2 in said base 1, is placed a threaded bushing 3 which has in its lower portion; an opening 4, admitting the plunger 5 to move freely therein and yet snugly; in its upper end "it has tapped opening G'tapped with 14- 20vleft hand tap and inw'hich the screw 7 moves.

The plunger 5 is provided with ahole' in itscenter, tapped with 1 120 right hand tap in which the screw 8 moves; it is also providedfwith a slotf9 which permits the plunger 5 to-move up and down in the opening in the bushin 3, but .not turn,'as

a pin 10' passes throng the. bushing 31m the slot 'in'the Plunger The screws 7 and 8 are threaded on "one f piece, screw 7 being a left'hand thread and screw 8 being a right hand thread; 'At" the end of screw 7 is provided apin 11-Ifitted in at right angles to the screw. This pin travels up and down in a slot 12 provided in the bushing 13 as the screws are operated, while bushing 13 remains in its same vertical position, partaking only of'a ro.-

S unification of Letters latent.

tatin motion. The bushing 13 is held in its vertical position by being firmly attached to the shaft 14; and further by collars 15 and 16 which are pinned to the shaft and located on eitherside of the dial plate 17, which in turn is screwed to the cast iron base 1 through bushings provided as 1n 18.

Collar 15 is also attached to a disc 19 F gs. 1 and 3, said disc containing two notchedplaces for the reception of pins on another disc 20. This disc 19 is'attaohed firmly to the collar 15 which is attached to the shaft 14. It also has two and its indicator'hjand passes 100thousand, on thejdial "1 7 the cam 22 will engage a pin 25 on disc 20 and start it v frnent to the right "and pin 26 will thenengage in openirig27 and continue its function until the next higher numeral has been turned up in the indicator dial. It will .be' noted that the looseness otthe cam 22 is 29 at its upper end below the dialfplate 17, so that as the disk is tripped the plate Patented May 2, 1922. Application filed June 21, 1921. Serial No. 479,310.

29 turns step by step with each revolu- .tion of the thumbscrew and its numerals which run from 0 to 9 are successively brought into register with the opening 37 pinned to the shaft l l carries 'the main indicator hand 30 above thedial 1'7, and the shaft 14 passes upwardly through an opening in the lass cover 31 and terminates in the thu ibscrew 24 which forms the operating hand-piece. The thumb screw 24 'is'connected frictionally to the shaft 14;

it has a depending hollow cylindrical body having an inwardly extending annular flange .at its lower end which fits snugly around the upper end of the shaft let and against a shoulder 32 thereon, the flange of thethumb screw being held in frictional the feet permit the insertion between them of any piece of material not exceeding one engagement with the shoulder by a spiral spring 33 located in its hollow portion sur rounding the upper end of the shaft and held inoperative position by a screw ferrule which screws onto the upper end of the shaft and seats in the upper portion of-thethumb screw. The tension of the spring provides suflicient friction between the thumb screw and the shaft to turn the screws of the shaft in either direction until they have moved to their stopping point, when any further turning of the thumb screw will merely overcome its 'fric tional engagement with the shaft and not effect the threads of its screws.

It isplain' that when the thumb screw 24.

is rotated to the left the screw 7 descends in the bushing 3 and the screw 8 withdraws from the plunger 5 forcing the foot 35 on the plunger downward the distance of the" movement of the screw 7 in the bushing 3 tance tra'velei bythefoot 35 ateajch revo-v lution of thescrews '(fa'nd 8. It is equally obvious that when the thumb screw {is rotated tothe right the foot'35'is correspondinglyraised. The trippin'g wheels trip both leftand right to turn the numeral plate 29; when the thumb screw is] turned to theright the tripping is done at the end o1": each turn andf in advancing order from O to 9 on the "late 29, andjwhenit is turnedtothe left t e tripping is done at the beginning'of each turn and in reverse order from 9 t0 0 on'the plate. 29; with each revolution of the pointer 30 the plate turns one number so that its numerals are successively brought under the opening 37 in the dial 17. v

When the machine is adjusted or set the feet and 36 are in contact, and. the indicator hand 30 isat zero on the dial 17 and the numeral plate 29 shows 0 at the aperture 37. VThe drawings as shown'indicate the micrometer with its feetin open or extended position, which in practice represents a distanceof one (1) inch; this separation between the feet is obtainedby turning the thumb screw v24 to the right [ten (10) times,; the tripping indicator be ing turned forward ten (10) times during this operation so that the numeral plate 29 shows 0 at the aperture when the indicator= hand'30 stops. at zero on the dial 17, and

inch in thickness. After placing'the material to be measured between .the feet the thumb screw is rotated to the left: until the feet hold the piece snugly between them, s

extra pressurerbeing prevented by the fric-" tional movement of the thumb screw on the shaft 14. iAssuming for example that the piece of materail to be measured is750, thousandsor 53 of an inch thick, when 1t rests on the lower foot 36 there will be' an open spaceor gap between the material and the foot v35 equal to the CllffGIQIlCGbG- t veen 750 thousands and one thousand thousands, or'250 thousands 10f an inch, that the. foot 35 will havelno travel or cross to r reach the material, and as each hundred thousands of an inchis representedby one turn ofthe thumh-screwitwill require two andfone half turns of the thumb-screw to bring the foot 35 tightly againstthe measured piece; this operation willalso turn the r I l tripping indicator three points backward and show thenumeral" 7 at theaperture 37. In otherwords as the foot'35 was extended one inch and in being returned towardits to move only to within 750 thousands of its originaliposition owing to the material intervening,the cam 22 would move a pin original closed position hasbeen'permitted V i 25 immediately upon starting and continuev to move two other A pins. 25, turning :the

disc 20 and numeral' plate '29 from '0" to: 7

so that the latternumber' would appear in would register 50, 'makin a readingf offl 750 thousands of inch. I v 35 neednot beraised to' its highest position for each test; thus f for example if the material is %*of an inch thick the'thumb screw could be turned to the right four the: aperture 37 and the indicator hand 0 V times and would trip the numeralwheel .29 fourtimes, so. that the machine would read il5-thousands, and after the" material isflinse rted the thumb screw would be turned to the left to pass it's 0 position and as it does so thewwheel'29 would be tripped or moved to expose the numeral 3 at the aperture and the hand 30 'f'would continue until it reached-75' on; its dial;

the reading is then 375 thousands 01.8% of aninch. I Y

Iclaimi 7 1. 1 In a micrometer caliper, acbase having a bushing, aplunger held againstrotation in the lower. end of the bushing, the

bushing and plunger being oppositely threadedat their upperends,arscrew bolt having oppositely directed, screws to chgage the threads of the bushingand plunger,

a: shaft having athumb-piece, connections betwecn the shaft andscreW-bolt to "rotate thelatterfahd indicating mechanism operated bythe shaft. i

2; In, a micrometer caliper, a base hav-' ing a bushing threaded at its upper end, a

I plunger held against rotation in the lower, end of the bushing and'having an internal thread, a screw-bolt having a left hand screw engaging the thread of the bushing and a right hand screw engaging the thread of the plunger, a shaft having a thumbpiece, connections between the shaft and screw-bolt to rotate the latter, and an indieating mechanism operated by the shaft.

3. In a micrometer caliper, a base having a bushing, a plunger held against rotation in the lower end of the bushing, the bushing and plunger bein oppositely threaded at their upper ends; a screw-bolt having oppositely directed screws to engage the bush ing and plunger, a shaft having a thumhpiece, connections between the shaft and screw-bolt to rotate the latter, an indicating' dial, and indicating mechanism operated by the shaft comprising a pointer on the dial, a disk on the shaft having a pair of peripheral notches, a second'disk carrying alseries of pins to enter the notches and a series of trip pins, a trip collar on the I first disk engaging a trip pin at each revolution of the shaft, and a numeral plate carried by the second disk.

In testimony whereof I affix my signature.

JOHN P. 0mm? 

